E. Dold & Söhne GmbH & Co. KG

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E-Mail: dold-relays@dold.com

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IL 9069

Neutral Monitor

IL 9069


Nominal voltage

Approvals and Markings


  • 0048730
  • IL9069.12 3/N AC400/230V
In 3-phase systems with neutral often also single phase loads are connected between phase and... more

Product description

In 3-phase systems with neutral often also single phase loads are connected between phase and neutral. If the neutral is missing in a system like this, unsymmetric voltages occur, that could damage single phase consumers, if the voltage rises to high. Also consumers can stop to work if the phaseneutral voltage gets too low. The IL 9069 detects this problem and can switch off the system immediately.

Technical specifications

Measuring range max.: 415 V
Standard measuring range: 3/N AC 400/230 V
1- / 3-phase: 3
Operate delay: Yes
Output contacts: 2 C/O contacts
Width: 35 mm
Enclosure design: Distribution board
Type: IL 9069


  • According to IEC/EN 60255-1
  • Detection of
    - missing neutral in the system
    - broken neutral on IL/SL 9069
    - neutral exchanged against phase
  • Detection of phase failure also with disconnected load
  • For 3-phase systems
  • De-energized on trip
  • LED indicator for operation/state of output contacts
  • Single phase connection possible
  • Without auxiliary voltage
  • 2 cangeover contacts
  • Optionally with adjustable asymmetry detection and on delay
  • Devices available in 2 enclosure version:
    IL 9069: depth 59 mm with terminals at the bottom for installations
    systems and industrial distribution systems according to DIN 43880
  • SL 9069: depth 98 mm with terminals at the top for cabinets with
    mounting plate and cable duct
  • Width 35 mm